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Title: Atomic-resolution characterization of the effects of CdCl{sub 2} treatment on poly-crystalline CdTe thin films

Poly-crystalline CdTe thin films on glass are used in commercial solar-cell superstrate devices. It is well known that post-deposition annealing of the CdTe thin films in a CdCl{sub 2} environment significantly increases the device performance, but a fundamental understanding of the effects of such annealing has not been achieved. In this Letter, we report a change in the stoichiometry across twin boundaries in CdTe and propose that native point defects alone cannot account for this variation. Upon annealing in CdCl{sub 2}, we find that the stoichiometry is restored. Our experimental measurements using atomic-resolution high-angle annular dark field imaging, electron energy-loss spectroscopy, and energy dispersive X-ray spectroscopy in a scanning transmission electron microscope are supported by first-principles density functional theory calculations.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Department of Physics, University of Illinois at Chicago, 845 W. Taylor St. M/C 273, Chicago, Illinois 60607-7059 (United States)
  2. Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Ave., Building 440, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22310877
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CADMIUM CHLORIDES; CADMIUM TELLURIDES; COMPUTERIZED SIMULATION; DENSITY FUNCTIONAL METHOD; DEPOSITION; ELECTRONS; ENERGY-LOSS SPECTROSCOPY; GLASS; POINT DEFECTS; RESOLUTION; SOLAR CELLS; STOICHIOMETRY; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY SPECTROSCOPY